Mitsubishi Electric M32R Series User Manual page 772

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

19.4.3 DR Path Sequence

The data register that was selected during the IR path sequence prior to the DR path sequence is

operated on to inspect or set data in it. The DR path sequence is performed following the procedure

described below.

(1) Enter JTMS = high for a period of one JTCK cycle from "Run-Test/Idle" state to go to "Select-

DR-Scan" state. Which data register will be selected at this time depends on the instruction

that was set during the IR path sequence performed prior to the DR path sequence.

(2) Set JTMS = low to go to "Capture-DR" state. At this time, the result of boundary-scan test or

the fixed data defined for each register is set in the data register's shift register stage.

(3) Subsequently, enter JTMS = low to go to "Shift-DR" state. In "Shift-DR" state, the DR value

is shifted right one bit every cycle, and the data that was set in (2) is serially output from the

JTDO in. At the same time, the setup data serially entered from the JTDI pin is set in the data

number of bits of the selected data register (by entering JTMS = low), all bits of data can be

set in and read out from the shift register stage. To stop the shift operation in the middle, go

to "Pause-DR" state via temporarily "Exit1-DR" state (by setting JTMS input from high to

low). Also, to return from "Pause-DR" state, go to "Shift-DR" state via temporarily "Exit1-DR"

state (by setting JTMS input from high to low).

(4) Set JTMS = high to go from "Shift-DR" state to "Exit2-DR" state. This completes the shift

(5) Subsequently, enter JTMS = high to go to "Update-DR" state. In "Update-DR" state, the data

that was set in the data register's shift register stage is transferred to the parallel output

stage and, thus, the setup data becomes ready for use.

(6) Subsequently, enter JTMS = high to go to "Select-DR-Scan" state or JTMS = low to go to

"Run-Test/Idle" state.

19.4 Basic Operation of JTAG